Straight

def straight_dbu_factory(
    kcl: KCLayout,
    additional_info: Callable[
        ...,
        dict[str, MetaData],
    ]
    | dict[str, MetaData]
    | None = None,
    output_type: type[KC] | None = None,
    port_type: str = "optical",
    **cell_kwargs: Unpack[CellKWargs],
) -> StraightFactory[KC]:
    """Returns a function generating straights [dbu].

        ┌──────────────────────────────┐
        │         Slab/Exclude         │
        ├──────────────────────────────┤
        │                              │
        │             Core             │
        │                              │
        ├──────────────────────────────┤
        │         Slab/Exclude         │
        └──────────────────────────────┘
    Args:
        kcl: The KCLayout which will be owned
        additional_info: Add additional key/values to the
            [`KCell.info`][kfactory.settings.Info]. Can be a static dict
            mapping info name to info value. Or can a callable which takes the straight
            functions' parameters as kwargs and returns a dict with the mapping.
        cell_kwargs: Additional arguments passed as `@kcl.cell(**cell_kwargs)`.
    """
    _additional_info: dict[str, MetaData] = {}
    if _is_additional_info_func(additional_info):
        _additional_info_func: Callable[
            ...,
            dict[str, MetaData],
        ] = additional_info
    else:

        def additional_info_func(
            **kwargs: Any,
        ) -> dict[str, MetaData]:
            return {}

        _additional_info_func = additional_info_func
        _additional_info = additional_info or {}  # ty:ignore[invalid-assignment]

    ports = cell_kwargs.get("ports")
    if ports is None:
        if kcl.rename_function == rename_clockwise:
            cell_kwargs["ports"] = {"left": ["o1"], "right": ["o2"]}
        elif kcl.rename_function == rename_by_direction:
            cell_kwargs["ports"] = {"left": ["W0"], "right": ["E0"]}

    if output_type is not None:
        cell = kcl.cell(output_type=output_type, **cell_kwargs)
    else:
        cell = kcl.cell(output_type=cast("type[KC]", KCell), **cell_kwargs)

    @cell
    def straight(
        width: dbu,
        length: dbu,
        layer: kdb.LayerInfo,
        enclosure: LayerEnclosure | None = None,
    ) -> KCell:
        """Waveguide defined in dbu.

            ┌──────────────────────────────┐
            │         Slab/Exclude         │
            ├──────────────────────────────┤
            │                              │
            │             Core             │
            │                              │
            ├──────────────────────────────┤
            │         Slab/Exclude         │
            └──────────────────────────────┘
        Args:
            width: Waveguide width. [dbu]
            length: Waveguide length. [dbu]
            layer: Main layer of the waveguide.
            enclosure: Definition of slab/excludes. [dbu]
        """
        c = kcl.kcell()

        if length < 0:
            logger.critical(
                f"Negative lengths are not allowed {length} as ports"
                " will be inverted. Please use a positive number. Forcing positive"
                " lengths."
            )
            length = -length
        if width < 0:
            logger.critical(
                f"Negative widths are not allowed {width} as ports"
                " will be inverted. Please use a positive number. Forcing positive"
                " lengths."
            )
            width = -width

        if width // 2 * 2 != width:
            raise ValueError("The width (w) must be a multiple of 2 database units")

        li = c.kcl.layer(layer)
        c.shapes(li).insert(kdb.Box(0, -width // 2, length, width // 2))
        c.create_port(
            name="o1",
            trans=kdb.Trans(2, False, 0, 0),
            layer=li,
            width=width,
            port_type=port_type,
        )
        c.create_port(
            name="o2",
            trans=kdb.Trans(0, False, length, 0),
            layer=li,
            width=width,
            port_type=port_type,
        )

        if enclosure is not None:
            enclosure.apply_minkowski_y(c, layer)
        _info: dict[str, MetaData] = {
            "width_um": width * c.kcl.dbu,
            "length_um": length * c.kcl.dbu,
            "width_dbu": width,
            "length_dbu": length,
        }
        _info.update(
            _additional_info_func(
                width=width, length=length, layer=layer, enclosure=enclosure
            )
        )
        _info.update(_additional_info)
        c.info = Info(**_info)

        c.boundary = kdb.DPolygon(c.dbbox())
        c.auto_rename_ports()
        return c

    return straight